Re: [PATCH 00/16] vdpa: Add support for vq descriptor mappings

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On 9/13/2023 9:08 AM, Eugenio Perez Martin wrote:
On Wed, Sep 13, 2023 at 3:03 AM Lei Yang <leiyang@xxxxxxxxxx> wrote:
Hi Dragos, Eugenio and Si-Wei

My name is Lei Yang, a software Quality Engineer from Red Hat.  And
always paying attention to improving the live migration downtime
issues because there are others QE asked about this problem when I
share live migration status  recently. Therefore I would like to test
it in my environment. Before the testing I want to know if there is an
expectation of downtime range based on this series of patches? In
addition, QE also can help do a regression test based on this series
of patches if there is a requirement.

Hi Lei,

Thanks for offering the testing bandwidth!

I think we can only do regression tests here, as the userland part is
still not sent to qemu.
Right. Regression for now, even QEMU has it, to exercise the relevant feature it would need a supporting firmware that is not yet available for now. Just stay tuned.

thanks for your patience,

Regards and thanks

On Tue, Sep 12, 2023 at 9:04 PM Dragos Tatulea <dtatulea@xxxxxxxxxx> wrote:
This patch series adds support for vq descriptor table mappings which
are used to improve vdpa live migration downtime. The improvement comes
from using smaller mappings which take less time to create and destroy
in hw.

The first part adds the vdpa core changes from Si-Wei [0].

The second part adds support in mlx5_vdpa:
- Refactor the mr code to be able to cleanly add descriptor mappings.
- Add hardware descriptor mr support.
- Properly update iotlb for cvq during ASID switch.


Dragos Tatulea (13):
   vdpa/mlx5: Create helper function for dma mappings
   vdpa/mlx5: Decouple cvq iotlb handling from hw mapping code
   vdpa/mlx5: Take cvq iotlb lock during refresh
   vdpa/mlx5: Collapse "dvq" mr add/delete functions
   vdpa/mlx5: Rename mr destroy functions
   vdpa/mlx5: Allow creation/deletion of any given mr struct
   vdpa/mlx5: Move mr mutex out of mr struct
   vdpa/mlx5: Improve mr update flow
   vdpa/mlx5: Introduce mr for vq descriptor
   vdpa/mlx5: Enable hw support for vq descriptor mapping
   vdpa/mlx5: Make iotlb helper functions more generic
   vdpa/mlx5: Update cvq iotlb mapping on ASID change
   Cover letter: vdpa/mlx5: Add support for vq descriptor mappings

Si-Wei Liu (3):
   vdpa: introduce dedicated descriptor group for virtqueue
   vhost-vdpa: introduce descriptor group backend feature
   vhost-vdpa: uAPI to get dedicated descriptor group id

  drivers/vdpa/mlx5/core/mlx5_vdpa.h |  31 +++--
  drivers/vdpa/mlx5/core/mr.c        | 191 ++++++++++++++++-------------
  drivers/vdpa/mlx5/core/resources.c |   6 +-
  drivers/vdpa/mlx5/net/mlx5_vnet.c  | 100 ++++++++++-----
  drivers/vhost/vdpa.c               |  27 ++++
  include/linux/mlx5/mlx5_ifc.h      |   8 +-
  include/linux/mlx5/mlx5_ifc_vdpa.h |   7 +-
  include/linux/vdpa.h               |  11 ++
  include/uapi/linux/vhost.h         |   8 ++
  include/uapi/linux/vhost_types.h   |   5 +
  10 files changed, 264 insertions(+), 130 deletions(-)


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